7-segment LED for error codes: Remote controller is not required to pinpoint problems.

Ignition indicators: indicates which burner is fired up at the moment.

Utilizes the air-fuel ratio rod for added safety.

The drum thickness has been increased 25% for greater heat exchanger performance and to be more resistant to thermal stress.

Increase
in fin pitch: Fins are more "spread out" which improves the durability
of the heat exchanger. More space in-between the fins reduces
build-up. Higher temperatures at the top of heat exchanger reduces
condensation.